diff options
Diffstat (limited to 'main/channel.c')
| -rw-r--r-- | main/channel.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/main/channel.c b/main/channel.c index 05f54ffdf..f8f1fe637 100644 --- a/main/channel.c +++ b/main/channel.c @@ -104,6 +104,22 @@ struct chanlist { AST_LIST_ENTRY(chanlist) list; }; +#ifdef CHANNEL_TRACE +/*! \brief Structure to hold channel context backtrace data */ +struct ast_chan_trace_data { + int enabled; + AST_LIST_HEAD_NOLOCK(, ast_chan_trace) trace; +}; + +/*! \brief Structure to save contexts where an ast_chan has been into */ +struct ast_chan_trace { + char context[AST_MAX_CONTEXT]; + char exten[AST_MAX_EXTENSION]; + int priority; + AST_LIST_ENTRY(ast_chan_trace) entry; +}; +#endif + /*! \brief the list of registered channel types */ static AST_LIST_HEAD_NOLOCK_STATIC(backends, chanlist); @@ -314,6 +330,133 @@ static struct ast_cli_entry cli_channel[] = { AST_CLI_DEFINE(handle_cli_core_show_channeltype, "Give more details on that channel type") }; +#ifdef CHANNEL_TRACE +/*! \brief Destructor for the channel trace datastore */ +static void ast_chan_trace_destroy_cb(void *data) +{ + struct ast_chan_trace *trace; + struct ast_chan_trace_data *traced = data; + while ((trace = AST_LIST_REMOVE_HEAD(&traced->trace, entry))) { + ast_free(trace); + } + ast_free(traced); +} + +/*! \brief Datastore to put the linked list of ast_chan_trace and trace status */ +const struct ast_datastore_info ast_chan_trace_datastore_info = { + .type = "ChanTrace", + .destroy = ast_chan_trace_destroy_cb +}; + +/*! \brief Put the channel backtrace in a string */ +int ast_channel_trace_serialize(struct ast_channel *chan, struct ast_str **buf) +{ + int total = 0; + struct ast_chan_trace *trace; + struct ast_chan_trace_data *traced; + struct ast_datastore *store; + + ast_channel_lock(chan); + store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL); + if (!store) { + ast_channel_unlock(chan); + return total; + } + traced = store->data; + (*buf)->used = 0; + (*buf)->str[0] = '\0'; + AST_LIST_TRAVERSE(&traced->trace, trace, entry) { + if (ast_str_append(buf, 0, "[%d] => %s, %s, %d\n", total, trace->context, trace->exten, trace->priority) < 0) { + ast_log(LOG_ERROR, "Data Buffer Size Exceeded!\n"); + total = -1; + break; + } + total++; + } + ast_channel_unlock(chan); + return total; +} + +/* !\brief Whether or not context tracing is enabled */ +int ast_channel_trace_is_enabled(struct ast_channel *chan) +{ + struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL); + if (!store) + return 0; + return ((struct ast_chan_trace_data *)store->data)->enabled; +} + +/*! \brief Update the context backtrace data if tracing is enabled */ +static int ast_channel_trace_data_update(struct ast_channel *chan, struct ast_chan_trace_data *traced) +{ + struct ast_chan_trace *trace; + if (!traced->enabled) + return 0; + /* If the last saved context does not match the current one + OR we have not saved any context so far, then save the current context */ + if ((!AST_LIST_EMPTY(&traced->trace) && strcasecmp(AST_LIST_FIRST(&traced->trace)->context, chan->context)) || + (AST_LIST_EMPTY(&traced->trace))) { + /* Just do some debug logging */ + if (AST_LIST_EMPTY(&traced->trace)) + ast_log(LOG_DEBUG, "Setting initial trace context to %s\n", chan->context); + else + ast_log(LOG_DEBUG, "Changing trace context from %s to %s\n", AST_LIST_FIRST(&traced->trace)->context, chan->context); + /* alloc or bail out */ + trace = ast_malloc(sizeof(*trace)); + if (!trace) + return -1; + /* save the current location and store it in the trace list */ + ast_copy_string(trace->context, chan->context, sizeof(trace->context)); + ast_copy_string(trace->exten, chan->exten, sizeof(trace->exten)); + trace->priority = chan->priority; + AST_LIST_INSERT_HEAD(&traced->trace, trace, entry); + } + return 0; +} + +/*! \brief Update the context backtrace if tracing is enabled */ +int ast_channel_trace_update(struct ast_channel *chan) +{ + struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL); + if (!store) + return 0; + return ast_channel_trace_data_update(chan, store->data); +} + +/*! \brief Enable context tracing in the channel */ +int ast_channel_trace_enable(struct ast_channel *chan) +{ + struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL); + struct ast_chan_trace_data *traced; + if (!store) { + store = ast_channel_datastore_alloc(&ast_chan_trace_datastore_info, "ChanTrace"); + if (!store) + return -1; + traced = ast_calloc(1, sizeof(*traced)); + if (!traced) { + ast_channel_datastore_free(store); + return -1; + } + store->data = traced; + AST_LIST_HEAD_INIT_NOLOCK(&traced->trace); + ast_channel_datastore_add(chan, store); + } + ((struct ast_chan_trace_data *)store->data)->enabled = 1; + ast_channel_trace_data_update(chan, store->data); + return 0; +} + +/*! \brief Disable context tracing in the channel */ +int ast_channel_trace_disable(struct ast_channel *chan) +{ + struct ast_datastore *store = ast_channel_datastore_find(chan, &ast_chan_trace_datastore_info, NULL); + if (!store) + return 0; + ((struct ast_chan_trace_data *)store->data)->enabled = 0; + return 0; +} +#endif /* CHANNEL_TRACE */ + /*! \brief Checks to see if a channel is needing hang up */ int ast_check_hangup(struct ast_channel *chan) { |